package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MemberSignature;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;
import java.util.Set;

//定义切面，实现公共字段填充
@Aspect
@Component
@Slf4j
public class AutoFillAspect {
    //切入点
    //execution是说明拦截什么，annotation同时满足有这一个注解
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut(){ }


    //通知
    @Before("autoFillPointCut()")
    public void autoFill(//链接点
                         JoinPoint joinPoint){
        log.info("开始进行公共字段的自动填充..................");

        //获取到被拦截的方法的数据库类型
        MethodSignature signature = (MethodSignature)joinPoint.getSignature();//方法签名对象
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);//获得方法上的注解对象
        OperationType operationType=autoFill.value();//获得数据库类型


        //获取当前的实体对象（参数）
        Object[] args = joinPoint.getArgs();
        if(args==null||args.length==0){
            return;
        }

        Object entity= args[0];


        //准备赋值的数据
        LocalDateTime now = LocalDateTime.now();
        Long id= BaseContext.getCurrentId();

        //根据不同的操作类型来进行赋值
        if(operationType==OperationType.INSERT){
            try {
                Method setCreateTime = entity.getClass().getDeclaredMethod("setCreateTime", LocalDateTime.class);
                Method setUpdateTime = entity.getClass().getDeclaredMethod("setUpdateTime", LocalDateTime.class);
                Method setCreateUser = entity.getClass().getDeclaredMethod("setCreateUser", Long.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod("setUpdateUser", Long.class);

                setCreateTime.invoke(entity,now);
                setUpdateTime.invoke(entity,now);
                setCreateUser.invoke(entity,id);
                setUpdateUser.invoke(entity,id);
            } catch (Exception e) {
                e.printStackTrace();
            }

        }else if(operationType==OperationType.UPDATE){
            try {
                Method setUpdateUser = entity.getClass().getDeclaredMethod("setUpdateUser", Long.class);
                Method setUpdateTime = entity.getClass().getDeclaredMethod("setUpdateTime", LocalDateTime.class);

                setUpdateTime.invoke(entity,now);
                setUpdateUser.invoke(entity,id);

            } catch (Exception e) {
                e.printStackTrace();
            }
        }


    }
}
